Disc holding device and disc recording and/or reproducing device including disc mounting mechanisms and bias mechanisms for biasing a disc towards the mounting mechanisms

ABSTRACT

In place of a conventional tray, a pair of mounting stages  2  is arranged as a disc holding device, wherein six pairs of mounting stages  2  are vertically movably placed one upon another by arranging guide supports  23  through guide holes  2   i  of the pair of mounting stages  2  for mounting a disc thereon. Spring bearings  2   j  are arranged on the uppermost mounting stages  2 , inside which received are the lower ends of coil springs  24  enclosing spring guides  26  arranged between a top plate and a bottom plate, achieving reduced size and weight of the disc holding device for mounting discs thereon.

TECHNICAL FIELD

The present invention relates to a disc holding device and disc recording and/or reproducing device for receiving and recording/reproducing a plurality of discs.

BACKGROUND ART

There is a disc player by way of disc recording and/or reproducing device mounted on motor vehicles for recording and/or reproducing sound. The disc player is constructed to store a plurality of CDs (compact discs) in a magazine and change the whole CDs at a time together with the magazine. This leads to a device enlargement, so that the main body is received in a trunk, while only the part necessary for operation is arranged in a cabin. However, changing CDs is not possible during driving of the vehicle, and requires stop thereof to open the trunk, forming a bothersome affair.

On this account, vehicle-mounted disc players to be received in cabins are developed in recent years. Such vehicle-mounted disc player, which is required to enable storage of a plurality of CDs, is received in a predetermined in-dash space in the cabin. Accordingly, there remains an essential challenge of a reduction in size of the vehicle-mounted disc players.

The vehicle-mounted disc player includes a roughly rectangular-prism casing of a given dimension called 1 DIN size or the like, in which, for example, six mounting stages 2 for individually mounting six CDs thereon are placed one upon another to constitute a disc compartment. Six CDs can individually be loaded and ejected to successively select one of six CDs for reproduction.

The disc compartment is constructed to vertically movably place one upon another six plate-like mounting stages 2 for supporting roughly the entire surface of the respective discs. Upon reproduction, a selected tray on which a selected CD is mounted and tray(s) thereabove are all raised to insert into a space formed below the selected tray a turntable for holding and rotating the disc and an optical pickup unit for reproduction.

However, the tray for mounting a disc thereon is like a plate, leading to not only larger area to be surface treated for preventing a disc from being damaged, but greater weight of the disc compartment when having a plurality of mounting stages 2 placed. Moreover, the plate-like shape requires greater quantity of material, leading to an increase in manufacturing cost.

Therefore, the present invention aims to provide a disc holder and a disc recording and/or reproducing device that solve such problems.

DISCLOSURE OF THE INVENTION

A disc holding device in connection with claim 1 is constructed to include first and second disc holding means including first and second disc mounting means for mounting one and another sides of an outer peripheral portions of a disc and first and second bias means for biasing the one and another sides of the outer peripheral portions toward the first and second disc mounting means, wherein the first and second disc holding means are separately disposed to face each other so as to hold thereby said disc. This allows a reduction in size of the parts, resulting in possible reduction in weight and cost of the disc holding device and also the disc recording and/or reproducing device. Moreover, this allows a reduction in area to be surface treated for preventing a disc from being damaged.

The disc holding device in connection with claim 2 is constructed such that the first bias means and the second bias means comprise engaging portions to be engaged with a bias releasing means so as to release the disc upon recording and reproduction

The disc holding device in connection with claim 3 is constructed such that the one and another sides of the outer peripheral portions of the disc are substantially opposite to each other across a center portion of the disc.

A disc recording and/or reproducing device in connection with claim 4 is constructed such that a plurality of first disc holding means and a plurality of second disc holding means are separately disposed to face each other so as to hold thereby a plurality of discs.

The disc recording and/or reproducing device in connection with claim 5 is constructed such that the first bias means and the second bias means comprise engaging portion, respectively, and bias releasing means are provided to be engaged with the engaging portions for releasing the disc holding state produced by the first disc holding means and the second disc holding means.

The disc recording and/or reproducing device in connection with claim 6 is constructed to further comprise guide means for guiding a disc when the disc is loaded onto one of the plurality of first and second disc holding means.

The disc recording and/or reproducing device in connection with claim 7 is constructed such that the guide means comprise a recess for guiding the disc.

The disc recording and/or reproducing device in connection with claim 8 is constructed such that the guide means are fixedly mounted to a top plate of a casing.

The disc recording and/or reproducing device in connection with claim 9 is constructed such that the plurality of first and second disc holding means are movable with respect to said guide means so as to allow loading of the disc.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view of the appearance of a disc player showing an embodiment of a disc recording and/or reproducing device according to the present invention;

FIG. 2 is an exploded perspective view of the disc player;

FIG. 3(a) is an exploded perspective view of a disc compartment in the disc player, and FIG. 3(b) is a perspective view, partly broken, of the main part of mounting stages;

FIG. 4 show the disc compartment in the disc layer, wherein (a) is a plan view, and (b) is a front view;

FIG. 5 is a perspective view of the inside of a casing as seen from the rear side;

FIG. 6 is an exploded perspective view of transfer means, torque providing means, etc.;

FIG. 7 is a perspective view of reproducing means;

FIG. 8 is a sectional view of the main part of holding means;

FIG. 9 is a front view of a pickup unit;

FIG. 10 shows positioning means, wherein (a) is a rear view when the holding means are positioned in the standby position, and (b) is a rear view when they are positioned in the reproduction position;

FIG. 11 show operating means, wherein (a) is a front view of a pickup lifting/lowering stage and a disc lifting/lowering stage, (b) is a front view of an inner slider, and (c) is a front view of an outer slider;

FIG. 12 is an operation explaining view of the operating means, showing the mode switching position in the state of loading/unloading mode for carrying out CD loading and ejection;

FIG. 13 show case of loading/unloading the top but one CD, wherein (a) is an operation explaining view of the operating means in the standby state where the second CD is selected, and (b) is an operation explaining view of the operating means with a shutter opened;

FIG. 14 is an operation explaining view of the operating means with a push lever rotated, when the top but one CD is ejected;

FIG. 15 show state of reproduction mode for carrying out CD reproduction, wherein (a) is an operation explaining view of the operating means when the top but five CD is reproduced, and (b) is an operation explaining view of the operating means when the topmost CD is reproduced;

FIG. 16 show case of reproducing the top but one CD, wherein (a) is an operation explaining view of the operating means when a pin is in (D) position or standby state, and (b) is an operation explaining view of the operating means when the pin is in (I) position or reproduction state;

FIG. 17 show the disc player upon CD loading, wherein (a) is a plan view, and (b) is a front view;

FIG. 18 is a lateral sectional view of the disc player upon CD loading;

FIG. 19 show push means upon CD ejection, wherein (a) is a plan view, and (b) is a front view;

FIG. 20 is a lateral sectional view of the push means upon CD ejection;

FIG. 21 show operation of a separating cam, wherein (a) is an operation explaining view illustrating the relationship with the mounting stages 2, and (b) is an operation explaining view illustrating the relationship with the pin;

FIG. 22 is a side view showing the state before the separating cam starts separation of the mounting stages 2;

FIG. 23 is a side view showing the state where the mounting stages 2 are separated into two parts by the separating cam;

FIG. 24 is a side view showing the state where the mounting stages 2 are separated into three parts by the separating cam;

FIG. 25 is a side view showing the state where selected CD is mounted on a turntable and held by hold means as a result of only a selected tray being lowered after separation of the mounting stages 2 into three parts;

FIG. 26 is a side view showing the state where the selected tray is separated from selected CD as a result of only the selected tray being lowered again after selected CD is held by the hold means;

FIG. 27 is an explanatory view showing the state where selected CD Is opened as a result of a plate spring for the selected tray being moved upward upon reproduction;

FIG. 28 show torque providing means, wherein (a) is an operation explaining view when torque is not provided, and (b) is an operation explaining view when torque is provided;

FIG. 29 is an operation explaining view showing the state where torque is provided to the hold means;

FIG. 30 is an operation explaining view showing the state where the hold means occupy the standby position;

FIG. 31 is an operation explaining view showing the state where the hold means occupy the reproduction position;

FIG. 32 is an operation explaining view showing the state of restriction means when the hold means occupy the standby position;

FIG. 33 show restriction means when the hold means occupy the reproduction position, wherein (a) is an operation explaining view showing the state where holding is blocked, and (b) is an operation explaining view showing the state where blocking is released; and

FIG. 34 is an operation explaining view showing the state where the hold means hold CD due to blocking released by the restriction means.

BEST MODE FOR CARRYING OUT THE INVENTION

A description is made hereafter with regard to an embodiment of a disc holder and a disc recording and/or reproducing device according to the present invention. This embodiment is an embodiment that the present invention is applied to a disc player for reproducing sound.

(A) General Configuration for the Structure of Disc Player

As shown in FIGS. 1-11, a disc player generally comprises a casing 1 for defining an external shape, a disc compartment 3 disposed in the casing 1 on the front side for storing CDs, transfer means 5 arranged in a loading/unloading opening 4 of a front plate 1 a of the casing 1 and for loading and ejecting CDs from the disc compartment 3, opening/closing means 6 arranged on the front side of the transfer means 5 and for opening and closing the loading/unloading opening 4 of the front plate 1 a, reproduction means 7 disposed in the casing 1 on the rear side and for selecting and reproducing any one of CDs in the disc compartment 3, push means 8 arranged in the disc compartment 3 on the left and right of the rear side and for pushing CD to be ejected toward the transfer means 5, and operation means 9 arranged mainly outside left and right side plates 1 b, 1 c of the casing 1 and for operating the disc compartment 3, the reproduction means 7, etc.

The reproduction means 7 comprise space forming means 11 disposed on both sides of a pickup lifting/lowering stage 10 which moves vertically and for forming spaces above and below a selected one of CDs in the disc compartment 3, hold means 14 comprising a lower arm 13 and an upper arm 12 which are rotatably arranged on the pickup lifting/lowering stage 10 and entering in the spaces for holding the selected CD, disc driving means 15 mounted to the lower arm 13 and for driving the held CD, a pickup unit 16 mounted to the lower arm 13 and for reading information on the rotating CD, torque providing means 17 for transmitting torque to the hold means 14 only in the reproduction mode wherein CD is reproduced and not in the loading/unloading mode wherein CD is loaded or unloaded, and restriction means 18 for setting a timing where the hold means 14 hold CD.

(B) Casing

The casing 1 comprises front plate 1 a, side plates 1 b, 1 c, top plate 1 d, and bottom plate 1 e, and has a rear open. The side plates 1 b, 1 c and the bottom plate 1 e are integrated with each other.

(C) Disc Compartment

As shown in FIG. 3(a), the disc compartment 3 comprises six disc holding devices 27 placed one upon another and each for holding one disc. The disc holding device 27 comprises a pair of mounting stage 2 as first disc holding means and second disc holding means. The pair of mounting stages 2 is constructed to hold respectively a first outer peripheral portion and a second outer peripheral portion, which face each other across the center of the disc. The six disc holding devices 27 are mounted on the disc lifting/lowering stage 22 which are vertically movably supported through four guide supports 23. Both ends of each guide support 23 are connected and supported to the bottom plate 1 e and the top plate 1 d.

As shown in FIG. 4, resins 2 b are placed on the outside upper face of thin aluminum plates 2 a as first and second disc mounting means. A pair of pins 2 c,2 d is arranged on each resin 2 b in the middle and rear portions to protrude laterally. The front pin is longer than the rear pin. The height of the resin 2 b is set to be substantially the same as the thickness of CD. A front portion of plate springs 2 e as first and second bias means is secured to the upper face of the resin 2 b to hold CD between the spring and the aluminum plate 2 a. A presser 2 f is formed on the rear inside of the plate spring 2 e for pressing CD, whereas formed on the rear outside of the plate spring 2 e are a receiver 2 g pressed downward by the lower face of a separating cam 82 as described later, and a receiver 2 h as an engagement undergoing an upward force from the lower face of an upper-stage engagement 82 j as bias releasing means as described later. In front and rear portions of the respective resins 2 b,guide holes 2 i are formed through the resins 2 b and the aluminum plate 2 a to receive the guide supports 23. Pads, not shown, are circularly placed on both faces of the aluminum plate 2 a in a portion which the vicinity of the outer peripheral face of CD contacts. As shown in FIG. 3(a), cylindrical spring bearings 2 j are integrated with both ends of the resin 2 b of the uppermost mounting stages 2 so as to receive coil springs as bias means 24 arranged between the top plate 1 d and the uppermost mounting stages 2. As shown in FIG. 3(b), a lower end of the spring bearing 2 j slightly protrudes inward to form a receiver 2 k that receives a lower end of a coil spring 24. This is arranged to prevent a load required for compression from excessively being greater even if the compression length is larger with use of a long spring.

On the other hand, the disc lifting/lowering stage 22 has both ends bent upward. Guide holes 22 a are formed in a horizontal part of the stage to receive the guide supports 23; and a pair of pins 22 b is secured to outer faces of left and right vertical parts of the stage to protrude horizontally. The pair of pins 22 b protrudes outside the casing 1 through two vertical slits 25 formed in the respective side plates 1 b, 1 c of the casing 1.

The disc lifting/lowering stage 22 and the six pairs of mounting stages 2 are vertically movably supported by arranging the guide supports 23 through the guide holes 22 a, 2 i. Four spring guides 26 have respective upper and lower ends secured to the top plate 1 d and the bottom plate 1 e of the casing 1, each spring guide being arranged through the spring receiver 2 s. A lower end of the coil spring 24 as bias means arranged to enclose the spring guide 26 abuts on the receiver at the lower end of the spring receiver 2 i.

(D) Transfer Means

As shown in FIG. 2, the transfer means 5 are arranged with the front plate la of the casing 1. The loading/unloading opening 4 is formed in the front plate 1 a. A drive shaft 30 and a driven shaft 31 are rotatably supported in the loading/unloading opening 4. Both ends of the drive shaft 30 are rotatably mounted to the front plate 1 a, whereas both ends of the driven shaft 31 are arranged through a vertically extending slot 32 formed in a side face of the front plate 1 a. As shown in FIG. 12, in order to support the middle of the drive shaft 30 and the driven shaft 31, a small-diameter portion of the middle of the drive shaft 30 is rotatably engaged with a groove 33 a formed in the rear face of a resin bearing 33 having restricted downward movement. A small-diameter portion of the middle of the driven shaft 31 is rotatably engaged with a groove 34 a formed in the rear face of the vertically movable resin bearing 34 through a pair of guide protrusions and a pair of guide grooves, not shown. A pair of rubber rollers 35 is mounted to the driven shaft 31, and a pair of rubber rollers 36 is mounted to the drive shaft 30, wherein axial slide of each is restricted by a retaining ring, not shown. Circular grooves are formed at both ends of the drive shaft 31. A spring 38 for biasing the driven shaft 31 toward the drive shaft 30 has both ends engaged with a spring pin 37 secured to the side face of the front plate 1 a and the circular groove.

Means for driving the drive shaft 30 will be described. As shown in FIG. 6, a gear 39 is secured to a right end of the drive shaft 30, and gears 40, 41 and gears 42, 43 integrated with each other are rotatably supported by the inside of the right side face 1 c. A worm 44 meshed with the gear 43 and a gear 45 are integrally rotatably supported on the bottom plate 1 e, and a worm 47 is meshed with the gear 45 and secured to an output shaft of a transfer motor 46 mounted to the bottom plate 1 e.

As shown in FIGS. 2 and 5, press means 48 are arranged to automatically ensure operation of further pressing CD by a few millimeters after completion of CD loading by the rollers 35, 36. Three pairs of horizontally extending guide slots 49, 50, 51 are formed in the front plate 1 a above and below the loading/unloading opening 4. A pair of slide mounts 52 is arranged on left and right sides and at the rear of the front pate 1 a, and three guide pins 53, 54, 55 are secured to the slide mounts 52 and irremovably arranged through the guide slots 49, 50, 51. A resin vertical roller 57 is rotatably supported to the corresponding slide mount 52 in the rear portion through a vertical shaft 56. In order to bias the slide mounts 52 in the direction of approaching each other, a push spring 60 is arranged between a spring engagement 58 formed with the front face la and a spring engagement 59 formed with the slide mount 52.

CD at the level position corresponding to that of the vertical roller 57 is positioned horizontally by the vertical roller 57, whereas CDs above and below the vertical roller 57 are positioned by a pair of positioning rods 61, 62 vertically mounted to the bottom plate 1 e as shown in FIG. 5 and a pair of positioning rods, not shown, vertically mounted to the top plate 1 d. (The unillustrated positioning rods are disposed on an elongation of the positioning rods 61, 62, and a space is defined between the positioning rods 61, 62 and the unillustrated positioning rods to allow passage of CD to be loaded and unloaded).

When using a conventional tray, the vertical position of the front end of CD in the loading direction is guided by the presence of the tray upon loading of CD. On the other hand, the present embodiment includes no portion for vertically guiding CD, since the pair of mounting stages 2 is arranged as disc holding device. Then, a pair of disc guides) 63 is arranged as guide means for guiding the front end of CD in the loading direction. The disc guides 63 are mounted to a downward bent of part of the top plate 1 d as shown in FIG. 1. The disc guides 63 are formed out of resin, and have recesses 63 a formed in the opposed surfaces to restrain the vertical direction of the front end of CD to be loaded.

(E) Opening/closing Means

The opening/closing means 6 for opening and closing the loading/unloading opening 4 of the front face 1 a will be described. A shutter 64 is vertically movably mounted to the front plate 1 a on the front face as shown in FIG. 2. An opening 64 a is formed in the shutter 64 to allow passage of CD, wherein when the shutter 64 is raised, the middle level position of the opening 64 a corresponds to a boundary position between the rollers 35, 36 to have the opening 64 a “open”, and when the shutter 64 is lowered, the opening is “closed”.

Specifically, a pair of upper and lower guide pins 65 is mounted to the front plate 1 a on left and right sides, and a pair of vertically extending guide slots 64 b is formed in the shutter 64. A retaining ring is engaged with a head of each guide pin 65 arranged through the guide slots 64 b. In order to have a distance between the slide mounts 52 larger only when the shutter 64 is raised to “open”, the guide pins 54 in the vicinity of the center are set to be longer than the other guide pins 53, 55, and a pair of L-shaped guide holes 64 c is formed in the shutter 64 to receive the respective guide pins 54. A guide rail 64 d is formed with the upper face of each guide hole 64 c so that the shutter 64 is forcibly raised to “open” when CD is ejected by constraint in enlarging the distance between the vertical rollers 57 for some reason.

A link mechanism for opening and closing the shutter 64 will be described. Laterally extending guide slots 66 a are formed in front and lower faces of a laterally slide plate 66 with roughly L-shaped section, and guide pins 67 are arranged through the guide slots 66 a and secured to the front plate 1 a and the bottom plate 1 e. Cam holes 64 e are formed in the shutter 64 on both sides and in the lower portion, whereas slide pins 66 b are secured to the laterally slide plate 66 on both sides and on the front face, and are arranged through the respective cam holes 64 e. As shown in FIG. 17(b), spring engagements 66 c, 68 are formed with the lower faces of the laterally slide plate 66 and the bottom plate 1 e to protrude downward, and a return spring 69 is provided between the two. A longitudinally slide plate 70 is longitudinally slidably mounted to the left lower face of the bottom plate 1 e. Specifically, a pair of guide slots 70 a is formed in the longitudinally slide plate 70, and a pair of headed pins, not shown, is arranged through the guide slots 70 a and secured to the bottom plate 1 e. A roughly L-shaped lever 72 has a bent rotatably mounted to the lower face of the bottom plate 1 e through a stationary shaft 73 as shown in FIG. 5, and ends formed with respective slots 72 a. Pins 66 d, 70 b are secured to the laterally slide plate 66 and the longitudinally slide plate 70 and loosely engaged with slots 72 a,respectively. A pressed portion 70 c, pressed by an outer slider 140 as described later, is formed with the longitudinally slide plate 70.

(F) Reproduction Means

The reproduction means 7 are disposed close to the rear of the disc compartment 3 to minimize the depth of the disc player. Since the hold means 14 in the reproduction means 7 are mounted to the pickup lifting/lowering stage 10 as shown in FIG. 2, a description will be made first with regard to the pickup lifting/lowering stage 10.

The pickup lifting/lowering stage 10 comprises a horizontal plate and vertical plates disposed on both sides and integrated with the horizontal plate. A circular recess 10 a is formed in the horizontal plate in the front portion to allow CD insertion. A pair of horizontally protruding pins 77 is secured to each vertical plate to move vertically the pickup lifting/lowering stage 10. The pair of pins 77 is positioned at the same level, and is shorter than the pair of pins 22 b of the disc lifting/lowering stage 22. The pins 77 are arranged through a pair of vertical slots 78 formed in the side plates 1 c, 1 b of the casing 1 to protrude outward.

1) Space Forming Means

As shown in FIG. 2, the separating cams 82 made of resin are longitudinally slidably arranged inside the vertical plates of the pickup lifting/lowering stage 10, which serve as space forming means 11 inserted between the two mounting stages 2 vertically placed one upon another and for forming spaces above and below the selected CD. Specifically, a guide slot 10 a is formed in the vertical plate of the pickup lifting/lowering stage 10 in the upper front portion, and a headed guide pin 82 a is arranged through the guide slot 10 a and secured to the separating cam 82. As shown in FIG. 3(a), a guide slot 82 b is formed in the separating cam 82 in the lower portion, and a headed guide pin 10 b of FIG. 2 is arranged through the guide slot 82 b and secured to the vertical plate in the longitudinally middle portion.

The separating cams 82 are inserted between the mounting stages 2 to lift the four pins 2 c, 2 d of the pair of mounting stages 2, thereby stably supporting the mounting stages 2 and forming spaces above and below the pair of mounting stages 2 mounting thereon CD to be reproduced. The separating cams 82, having the shape obtained by placing two plates of different longitudinal lengths formed with a slit, slip into below the mounting stages 2 to move upward the pair of long pins 2 d of the mounting stages 2 through the front portions and the pair of short pins 2 d through the rear portions.

Specifically, the configuration is as follows. A pair of first separating control parts 82 c ₁, 82 c ₁ is formed to move upward the pair of selected mounting stages 2 for mounting the selected CD and the mounting stages 2 thereabove, whereas a pair of second separating control parts 82 c ₂, 82 c ₂ is formed above the respective first separating control parts 82 c ₁ to move upward only the mounting stages 2 above the selected mounting stages 2. Third separating control parts 82 d are formed between the first separating control parts 82 c ₁ and the second separating control parts 82 c ₂, respectively, for holding only the selected mounting stages 2. The first separating control part 82 c ₁, second separating control part 82 c ₂, and third separating control part 82 d constitute a separating control part. Formed with the separating cam 82 along the moving direction are a top face 82 f for holding the position of the pins 2 c, 2 d of the mounting stages 2 above the selected mounting stages 2, and a lower face 82 h as position restriction means for holding the position of the pins 2 c, 2 d of the mounting stages 2 below the selected mounting stages 2 and retaining the receiver 2 g of the plate spring 2 e.

The pins 2 c, 2 d of the selected mounting stages 2 and the mounting stages 2 thereabove are lifted up by forward movement of the first and second separating control parts 82c₁, 82c₂, so that θ is fundamentally set to a predetermined value, e.g. 45°. Here, however, the mounting stages 2 are lifted in compressing the coil springs 24, so that as the position of the mounting stages 2 is higher, the amount of compression of the coil springs 24 is greater to increase a load acting upon lifting of the mounting stages 2. That is, a load is smaller at an initial stage of compression of the coil springs 24. As a result, as shown in FIG. 21(a), θ₁ in an upper portion of the first and second separating control parts 82 c ₁, 82 c ₂ is set, e.g. to 45°, and θ₂ in a lower portion is set, e.g. to 60°, with the middle portion of the two including a circular face to have a constant load.

FIG. 35 shows an example of reference of the separating cam 82. In order to horizontally move the separating cam so as to raise the mounting stages 2, the cam was designed typically with a linear taper face of cam angle θ of 45° or less. However, in the case of the cam shape in FIG. 35, the level to be raised by the cam and the cam stroke are limited to 1:1, so that the cam stroke is longer, leading to enlarged device size.

Next, the third separating control parts 82 d,82 d will be described. The third separating control part 82 d,82 d comprises upper-stage engagements 82 j, 82 j, middle-stage engagements 82 k, 82 k, and lower-stage engagements 82 m, 82 m. The upper-stage engagements 82 j, 82 j serve to form spaces above and below the selected mounting stages 2, the middle-stage engagements 82 k, 82 k serve to lower the selected mounting stages 2 and CD together to place the selected CD on a turntable 97 of the lower arm 13, and the lower-stage engagements 82 m, 82 m serve to lower only the selected mounting stages 2 again to separate them from the selected CD. The lower face of the upper-stage engagement 82 j constitutes bias releasing means for biasing upward the receiver 2 h of the plate spring 2 e of said mounting stages 2 to release bias resulting from the plate spring 2 e.

2) Hold Means

The hold means 14 will be described, which are rotated toward the spaces formed by the space forming means 11 above and below the selected CD to hold the selected CD. Base ends of the lower and upper arms 13, 12 are rotatably mounted to the pickup lifting/lowering stage 10 on the left. Specifically, the configuration is as follows. As shown in FIG. 8, a hollow shaft 86 has a near lower end secured to the lower arm 13, and a lower end rotatably arranged through the pickup lifting/lowering stage 10, with which a flat washer 93 and a retaining ring 94 are engaged for anti-disengagement. A sleeve 87 of copper alloy is fixedly engaged with the base end of the upper arm 12, through which the hollow shaft 86 is arranged so that the upper arm 12 is lowered parallel to the lower arm 13 to hold the selected CD. A flat washer 88 and a retaining ring are engaged with an upper end of the hollow shaft 86. A hold spring 89 is arranged between the flat washer 88 and the sleeve 87 to bias the upper arm 12 downward. As shown in FIG. 7, in order to obtain synchronous unitary rotation of the lower and upper arms 13, 12 about the hollow shaft 86 without any relative rotation, a slide pin 90 is provided on the lower arm 13 and slidably arranged through a hole 91 formed in the upper arm 12. In order to improve the positioning accuracy of the turntable 97 as describe later on the lower arm 13 with respect to CD upon rotation of the hold means 14, a support 92 is provided on the bottom plate 1 e and arranged through the hollow shaft 86 on the pickup lifting/lowering stage 10.

3) Disc Driving Means

The disc driving means 15 are arranged on the top face of a head of the lower arm 13. Specifically, as shown in FIG. 7, the spindle motor 96 is mounted, having an output shaft to which the turntable 97 is mounted to engage with a center hole of CD. On the other hand, as shown in FIG. 34, a support plate 98 has one end secured to a head of the upper arm 12 in the vicinity thereof, and another end formed with a circular hole. A chuck plate 99 made of resin and having a rib-like protrusion formed circularly on the lower face of a disc is rotatably engaged with the hole from above. Anti-disengagement of the chuck plate 99 is ensured by another end of a spring plate, not shown, having one end secured to the lower face of the upper arm 12. CD is held by the turntable 97 and the chuck plate 99.

4) Pickup Unit

As shown in FIG. 9, the pickup unit 16 is also mounted on the top face of the lower arm 13. The configuration of the pickup unit 16 will be described. An optical pickup 162 is arranged to be movable along the longitudinal direction of the lower arm 13 through a guide rail 161 integrated with the lower arm 13. Also arranged are means for reciprocating the optical pickup 162 along the guide rail 161. A threaded shaft 164 is rotatably supported on the top face of the lower arm 13 through a pair of bearing members 163, with which a female thread portion, not shown, of the optical pickup 162 is meshed. An output shaft of a scanning motor 165 arranged in the vicinity of the sleeve 87 is coupled with the threaded shaft 164. Specifically, a gear 168 having a worm wheel 166 and a crossed helical gear 167 integrated with each other is supported rotatably, wherein the worm wheel 166 is meshed with a worm of the output shaft of the motor 165, and the crossed helical gear 167 is meshed with a crossed helical gear 170 mounted to the threaded shaft 164.

5) Torque Providing Means

The torque providing means 17 rotate the hold means 14 by torque from the transfer motor 46. As show in FIG. 6, a gear train 103 is arranged inside the left side plate 1 b of the casing 1. Specifically, the gear train 103 comprises gears 103 a-103 h. A gear 104 is also secured to a left end of the drive shaft 30. A plate 105 is vertically movably arranged inside the left side plate 1b. Specifically, a vertically extending guide slot 105 a is formed in an upper portion of the plate 105, through which a guide pin 106 (see FIG. 28) is arranged. The guide pin 106 is secured to the left side plate 1 b, and has a retaining ring mounted thereto. Spring engagements 105 b, 107 are formed with a lower portion of the plate 105 and the bottom plate 1 e of the casing 1 e, and a return spring 108 is arranged between the two for biasing the plate 105 downward. An escape hole 105 c is formed in the plate 105 to receive a shaft 109 (secured to the side plate 1 b) of the gear 103 h. A base end of a lever 110 is rotatably mounted to the shaft 109. A shift shaft 111 is arranged through the lever 110 and secured to a head of the shaft 109. A gear 112 is rotatably mounted to the shift shaft 111 and meshed with the gear 103 h. A cam hole 105 d is formed in the plate 105 above the escape hole 105 c, through which an end of the shift shaft 111 is arranged. Specifically, when moving the plate 105 upward, the cam hole 105 d is moved upward, and the shift shaft 111 arranged through the cam hole 105 d is moved forward, thereby also obtaining mesh of the gear 112 mounted to the shift shaft 111 with the gear 104 of the drive shaft 30. In order to move the plate 105 upward, a middle portion of the lever 113 is rotatably supported by the inside of the left side plate 1 b through a pin 114, and one end of the lever 113 is rotatably connected to a lower portion of the plate 105 through a pin 115. Another end of the lever 113 faces a lower portion of the front one of the guide holes 25 of the left side plate 1 b through which the pin 22 b of the disc lifting/lowering stage 22 is arranged. That is, when the disc lifting/lowering stage 22 is in the lowermost position to enter the reproducing mode, the pin 22 b pushes another end of the lever 113 downward to mesh the gear 112 with the gear 104.

Then, the uppermost gear 103 a of the gear train 103 is coupled with the lower arm 13 of the hold means 14 as follows. As shown in FIG. 2, a slide bar 116 is arranged which comprises a longitudinally lengthened vertical part and a horizontal part integrated with the vertical part in the rear portion. A pair of guide slots 116 a is formed in the slide bar 116 in the vicinity of both sides of the vertical part, and, as shown in FIG. 5, a pair of guide pins 117 is arranged through the pair of guide slots 116 a and secured to the inside of the left side plate 1 b, each having a retaining ring mounted thereto. In such a way, a rack 116 b is formed with a lower front portion of the longitudinally slidably slide bar 116 to mesh with the gear 103 a, whereas an engagement pin 116c protruding downward has an upper end secured to a head of the rear portion of the horizontal part. As shown in FIG. 7, the engagement pin 116 c is integrated with a base end of the lower arm 13, and is loosely engaged with a slot 13 a formed in the horizontal part and extending to the level of the upper arm 12. As shown in FIG. 9, the slot 13 a is formed to extend along a radial straight line passing through the axis of the sleeve 87 and orthogonal to the sleeve 87.

The disc player has two modes, i.e. loading/unloading mode wherein CD is loaded and ejected from the disc compartment 3 and reproducing mode wherein CD is reproduced. In the former case, the hold means 14 occupy a position B as shown in FIG. 30, whereas in the latter case, the hold means occupy a position A as shown in FIG. 31. Rotation of the hold means 14 between the position B and the position A is carried out through the torque providing means 17 as described above. However, due to need of accurate positioning of the selected CD with respect to the turntable 97 on the lower arm 13, there are arranged positioning means 118 of FIG. 10.

The configuration of the positioning means 118 will be described. As shown in FIGS. 9-10, a positioning pin 119 protruding downward has an upper end secured to the lower arm 13 in the vicinity of the hollow shaft 86. A circular hole 10 c is formed in the pickup lifting/lowering stage 10 in a portion corresponding to the range that the positioning pin 119 moves in accordance with rotation of the hold means 14. The positioning pin 119 is loosely engaged with the circular hole 10 c. A spring engagement 10 d is formed with the pickup lifting/lowering stage 10 to protrude downward. Both ends of a toggle spring 120 are engaged with the positioning pin 119 and the spring engagement 10 d. Assuming that the positioning pin 119 are in positions b, a when the hold means 14 occupy the positions B, A, a position c that is a midpoint between the position b and the position a corresponds to a point of inflection where the moving direction of the positioning pin 119 is changed, so that the spring engagement 10 d is placed in a position corresponding to the position c.

6) Restriction Means

The upper arm 12 of the hold means 14 is biased downward by the hold spring 89, and includes restriction means 18 for setting a timing for lowering the upper arm 12 by a biasing force of the hold spring 89 as shown in FIG. 7. Specifically, the configuration is as follows:

A cylindrical plate 124 is erectly arranged on the top face of the pickup lifting/lowering stage 10 and between the hold means 14 and the 20 separating cam 82. The cylindrical plate 124 forms a partial cylinder including part of a cylinder with center at the sleeve 87, and has an L-shaped guide slot 125 comprising a horizontal part 125 a extending circumferentially and a vertical part 125 b extending axially as shown in FIGS. 32-33. A guide pin 12 a is secured to the base end of the upper arm 12 to protrude outward in the radial direction of the sleeve 87. The guide pin 12 a is arranged through the guide slot 125. As a result, in FIG. 7, when the hold means 14 occupy the position B or standby position and immediately before the hold means moved from the position B occupy the position A or reproduction position, the guide pin 12 a is positioned in the horizontal part 125 a of the guide slot 125. Thus, even with a biasing force of the hold spring 89 being applied, the upper arm 12 is not lowered to allow the hold means 14 to be open. On the other hand, when the hold means 14 are in the position A, the guide pin 12 a is positioned in the vertical part 125 b, so that the upper arm 12 is lowered by a biasing force of the hold spring 89 to lower the guide pin 12 a to a lower end of the vertical part 125 b.

In order that the hold means 14 may not start hold operation as soon as the hold means 14 are rotated to the position A as shown in FIG. 7 to rotate the guide pin 12 a to the vertical part 125 b of the guide slot 125, but may start hold operation only after receiving a command, there are arranged first restriction means for temporarily restricting downward movement of the guide pin 12 a,and second restriction means for releasing temporary restriction to hold the selected CD when forward movement of the separating cam 82 after temporary restriction causes the selected CD and mounting stages 2 to be lowered and placed on the turntable 97. Specifically, the configuration is as follows. A bearing plate 26 is erectly arranged on the top face of the pickup lifting/lowering stage 10 and between the cylindrical plate 124 and the separating cam 82 to be parallel to the separating cam 82 as shown in FIGS. 7 and 30. As shown in FIG. 7, a middle portion of a restraining arm 127 is rotatably supported by the inside of the bearing plate 126 through a rotation shaft 129, and a pin 127 a is secured to the restraining arm 127 in the front portion to protrude outward. A rear portion of the restraining arm 127 is bent inward to face the vertical part 125 b of the guide slot 125. As shown in FIG. 30, a spring 128 is arranged to bias the rear portion of the restraining arm 127 downward. The pin 127 a in the front portion of the restraining arm 127 is loosely engaged with a cam groove 82 r formed in the lower inside of the separating cam 82 as shown in FIG. 32. An escape is formed in an upper rear portion of the cam groove 82 r. When the separating cam 82 is moved forward to engage the pins 2 c, 2 d of the selected mounting stages 2 with the middle-stage engagements 82 k, 82 k, the pin 127 a can escape into the escape of the cam groove 82 r. Then, the restraining arm 127 is rotated by the spring 128, and the upper arm 12 is lowered by a biasing force of the hold spring 89.

(G) Push Means

The push means 8 are arranged inside the casing 1 on both sides thereof. Since the two push means 8 are substantially the same in configuration, one of which will be described. As show in FIGS. 1 and 19, a push lever 132 for pushing CD is rotatably mounted to a stationary shaft 133 that protrudes downward from the top plate 1 d of the casing 1. The push lever 132 is at the same level as that of the boundary between the rollers 35, 36. A return spring 134 is arranged to enclose the stationary shaft 133, and has both ends engaged with a spring engagement 132 a of the push lever 132 and a spring engagement of the top plate 1 d. The push lever 132 is rotated by backward movement of the separating cam 82 as described above, which is the direction opposite to that for space formation by forward movement thereof. Specifically, the configuration is as follows. As shown in FIG. 7, a plate 135 is arranged outside the bearing plate 126 to be slidable longitudinally by a predetermined amount. That is, a pair of guide slots 126 a is formed in the bearing plate 126, and a pair of guide pins 135 a is arranged through the pair of guide slots 126 a and secured to the plate 135. The plate 135 has a front side end bent inward to be engageable with a pressed portion 132 b integrated with the push lever 132, and a rear side end bent outward to protrude behind the separating cam 82.

(H) Operation Means

Finally, the operation means 9 will be described. In the loading/unloading mode, the operation means 9 lift and lower the disc lifting/lowering stage 22 to allow loading and unloading of CD on the mounting stages 2. and also operate the opening/closing means 6 and the push means 8. In the reproducing mode, the operation means 9 lift and lower the pickup lifting/lowering stage 10 to take the selected CD with the disc lifting/lowering stage 22 maintained in the lowermost position, and also operate the space defining means 11 and the restriction means 18.

As shown in FIGS. 2 and 11, an inner slide 139 and an outer slider 140 is longitudinally slidably arranged outside the left and right side plates 1 b, 1 c of the casing 1. Since the two are symmetrical, one of which will be described. Guide slots 139 a, 140 a are formed in the sliders 139, 140 in the upper and lower portions. Guide pins 158, 159 are arranged through the guide slots 139 a, 140 a and secure to the side plate, and have retaining rings mounted thereto. A pair of stepped slits 141 is formed in the inner slider 139 in the rear portion to lift and lower in a six-step way the pair of pins 77 of the pickup lifting/lowering stage 10 protruding from the vertical slit 78. A pair of stepped slits 142 is formed in the inner slider 139 in the front portion to lift and lower in a six-step way the pair of pins 22 b of the disc lifting/lowering stage 22 protruding from the vertical slit 25. A bottom slit 143 is continuously formed below each stepped slit 142 to lift and lower only the pickup lifting/lowering stage 10 in the reproducing mode with the disc lifting/lowering stage 22 maintained in the lowermost position. On the other hand, only a pair of slits for receiving the pair of long pins 22 b of the disc lifting/lowering stage 22 is formed in the outer slider 140. Specifically, formed in a communicating way are a square loading/unloading-mode slit 144 for moving upward and downward the pin 22 b received in the stepped slit 142, a horizontally extending reproducing-mode slit 145 for holding in the lowermost position the pin 22 b received in the bottom slit 143, and a 45° inclined switching slit 146 for switching the position of the pin 22 b between the stepped slit 142 and the bottom slit 143 by moving the pin 22 b upward or downward through taper faces 146 a, 146 b by slide operation of the outer slider 140 in any direction. If the reproducing-mode slits 145 are formed in the same vertical position, they are superimposed one upon another. Thus, the reproducing-mode slits 145, the loading/unloading-mode slits 144, the bottom slits 143, the stepped slits 142, and the pins 22 b inserted therein are positioned at different levels.

An upper portion of the outer slider 140 is bent inward orthogonally to form a protrusion 140 b. In order to allow movement of the protrusion 140 b together with the outer slider 140, an escape recess 139 b and an escape slit 147 are formed in the inner slider 139 and the side plate 1 b in rear portions thereof, respectively. In order that the separating cam 82 may slide together with the outer slider 140 regardless of the level position of the separating cam 82 that lifts and lowers with the pickup lifting/lowering stage 10, a vertical engagement groove 82 s is formed in the rear outside of the separating cam 82 as shown in FIG. 2, with which the protrusion 140 b is engaged slidably. An engagement 140 c is formed with the left outer slider 140 in the front portion to extend below the bottom plate 1 e of the casing 1. When the outer slider 140 is slid backward, the engagement 140 c presses the pressed portion 70 c backward to open the shutter 64 against a biasing force of the return spring 69.

Next, a drive mechanism will be described, which serves to simultaneously synchronously slide the right and left ones of the inner and outer sliders 139, 140. As shown in FIGS. 2 and 6, two connecting shafts 148, 149 are rotatably supported below the bottom plate 1 e of the casing 1 in the rear portion through two pairs of bearings. Pinions 150, 151 are secured to both ends of the connecting shafts 148, 149, and are meshed with racks 139 c, 140 c formed with the inner and outer sliders 139, 140 on the rear lower faces. Gears 152, 153 are secured to the connecting shafts 148, 149, and are individually coupled with operating motors 154, 155. Specifically, the configuration is as follows. The operating motors 155, 154 are mounted to upper and lower inside portions of the bearing plate 126 disposed in the right rear portion of the casing 1, and have output shafts coupled with the gears 152, 153 through two sets of reduction means 156, 157 arranged inside the bearing plate 126.

Next, operation of such disc player will be described.

(I) General Outline of Operation

Operation of the disc player is composed of three functions: loading of CDs into the disc compartment 3, ejection of CDs from the disc compartment 3, and selection and reproduction of one of CDs stored in the disc compartment 3.

(J) CD Loading

When loading CD into the disc compartment 3, the number assigned to the mounting stages 2 (the numbers 1-6 are assigned to the mounting stages 2 from top to bottom) is selected to push a number button, not shown, of, e.g. “2” before pushing a loading button, not shown. Rotation of an output shaft of the operating motor 154 is transmitted to the reduction means 156 and the connecting shaft 148 to slide the inner sliders 139. Independently, rotation of an output shaft of the operating motor 155 is transmitted to the reduction means 157 and the connecting shaft 149 to slide the outer sliders 140. When pushing the button with the pins 22 b entering the loading/unloading slits 144 of the outer slider 140 as shown in FIG. 12, for example, to be in the mode switching position in the loading/unloading mode, backward movement of the inner slider 139 raises the pins 22 b to the bottom but one step of the stepped slits 142 as shown in FIG. 13(a). With this, the disc lifting/lowering stage 22 is raised to set CD on the top but one mounting stages 2 at the level of the push lever 132. At that time, the pickup lifting/lowering state is raised simultaneously, which forms needless motion. Further backward movement of the inner slider 139 raises the pickup lifting/lowering stage 10 together with the pins 22 b to have the third to sixth mounting stages 2 at the level of the push lever 132 successively.

Then, when the outer slider 140 is moved backward from the standby position as shown in FIG. 13(a) to have the pins 22 b in the longitudinal middle position of the loading/unloading-mode slits 144, the engagement 140 c of the outer slider 140 presses backward the pressed portion 70 c shown in FIG. 2 below the bottom plate 1 e. Thus, movement of the longitudinally slide plate 70 is transmitted, through the lever 72, to the laterally slide plate 66 which is moved leftward against a biasing force of the return spring 69, raising the shutter 64 to open the loading/unloading opening 4 as shown in FIG. 17(b).

By the above action, the shutter 64 is opened, and the top but one mounting stages 2 is at the same level of the push lever 132 as described above, so that when inserting a CD 171 between the rollers 35, 36 as shown in FIG. 17(a), a sensor, not shown, disposed in the center of the front of the shutter 64 senses the CD 171 to rotate the transfer motor 46. Since torque from the transfer motor 46 is transmitted to the roller 36 through the gears, the CD 171 is bitten between the roller 36 and the roller 35 biased thereto by the spring 38 as shown in FIG. 18, and is loaded onto the top but one mounting stages 2 by rotation of the rollers 35, 36. In the state where the CD 171 is inserted halfway as shown by the two-dot chain line in FIG. 17(a), both sides of the CD 171 are inserted into the recesses 63 a of the disc guides 63 for guiding. Thus, the front end of the CD 171 is restricted vertically to allow horizontal loading of the CD 171. As being inserted only to the position separating from the rollers 35, 36, the CD 171 is pushed by last several millimeters in the center direction by the vertical rollers 57 biased by the push spring 60. The CD 171 is held on the mounting stages 2 by the pressers 2 f of the pair of plate springs 2 e. When the CD 171 separates from the rollers 35, 36, a limit switch, not shown, operates to stop rotation of the transfer motor 46, which causes simultaneously the outer sliders 140 to move forward and return to the standby position as shown in FIG. 13(a). Thus, the pressed portion 70 c that has been pressed backward is released to close the shutter 64 through operation of the return spring 69.

Likewise, when the pins 22 b are in any other level position of the stepped slit 142 (one of the first and third to sixth step from below), CD can be loaded therein in the same way.

(K) CD Ejection

When ejecting CD from the disc compartment 3, the number button of, e.g. “2”, is pushed together with an unloading button. Then, in the same way as upon loading, the pins 22 b are moved from the mode switching position in the loading/unloading mode as shown in FIG. 12 to the standby position as shown in FIG. 13(a) so as to set CD on the top but one mounting stages 2 at the level of the push lever 132. And when the outer slider 140 is moved backward to the position as shown in FIG. 13(b) in the same way as described above, the shutter 64 is opened. Operation up to here is quite the same as that upon CD loading.

Then, when the outer slider 140 is moved backward further until the pins 22 b become in the front of the loading/unloading-mode slits 144 as shown in FIG. 14, the separating cam 82 operating with the outer slider 140 through the rear protrusion 140 b of the outer slider 140 is moved backward as shown in FIG. 19 so that the rear face of the separating cam 82 presses the rear face of the plate 135 for backward movement. Then, the front face of the plate 135 presses the pressed portion 132 b of the push lever 132 backward to rotate the push lever 132 so as to push both sides of the CD 171 on the second mounting stages 2. Since the transfer motor 46 is driven to rotate the rollers 35, 36 at the instant when pushing the unloading button, the pushed CD 171 is ejected in being held between the rollers 35, 36 as shown in FIG. 20. At this time, in the same as upon loading, the CD 171 is guided by the recesses 63 a of the disc guides 63 for horizontal movement. In order to prevent the CD 171 from falling upon unloading, a limit switch, not shown, detects the CD 171 when the rear portion is partly held between the rollers 35, 36 to stop rotation of the transfer motor 46. After this, the CD 171 is removed manually between the rollers 35, 36. When a sensor, not shown, senses a removal of the CD 171, the outer sliders 149 are moved forward to return the pins 22 b from the position as shown in FIG. 14 to the standby position as shown in FIG. 13(a).

Then, due to elimination of a backward force applied to the plate 135 from the separating cam 82, the push lever 132 is rotated by a biasing force of the return spring 134 to return to an initial position as indicated by the fully drawn line in FIG. 19(a), then the shutter 64 is closed in the same way as after CD loading.

When the pair of pins 22 b occupies any other level position of the stepped slit 142 (one of the first and third to sixth step from below), CD can be ejected therefrom in the same way.

(L) CD Reproduction

When reproducing CD, the number button of, e.g. “2”, of the selected CD is pushed together with a reproduction button. Then, the inner slider 139 is moved forward from the position as shown in FIG. 13(a) to lower the pins 22 b to the mode switching position via the lowermost position of the loading/unloading-mode slits 144 as shown in FIG. 12 before the outer slider 140 is moved forward. Then, the upper taper faces 146 b of the switching slits 146 (see FIG. 11(c)) are pressed to lower the pins 22 b. As soon as the pins 22 b are moved to the bottom slits 143, they are moved into the reproducing-mode slits 145 of the outer slider 140 to achieve switching to the reproducing mode as shown in FIG. 15(a). Upon switching, the pins 77 of the pickup lifting/lowering stage 10 remain in the lowermost position of the stepped slits 141. At that time, the pins 22 b are positioned in the switching position from the reproducing mode to the loading/unloading mode. In this state, when moving the outer sliders 140 backward, the lower taper faces 146 a of the switching slits 146 are pressed to raise the pins 22 b which can thus return to the mode switching position in the loading/unloading mode as shown in FIG. 12.

The position of the pins 22 b with respect to the outer sliders 140 as shown in FIG. 15(a) corresponds not only to the mode switching position, but the CD selecting position where CD to be reproduced is selected by changing only the level of the pickup lifting/lowering stage 10. Specifically, if only the inner sliders 139 are moved backward from the position as shown in FIG. 15(a), the pair of pins 22 b is apparently moved forward along the bottom slits 143, but is actually held in the lowermost position of the vertical slits 25, obtaining no movement of the disc lifting/lowering stage 22 from the lowermost reproduction position. On the other hand, the other pair of pins 77, not seen due to presence of the outer sliders 140, is apparently relatively lifted along the stepped slits 141, but is actually lifted stepwise along the vertical slits 78. That is, when the pair of pins 22 b is positioned in the position of any of the numbers 1-6 assigned to the bottom slits 143 by moving the inner sliders 139 backward, the pins 77 are lifted or lowered at the level of the corresponding one of the number 1-6 assigned vertically to the stepped slits 142, allowing reproduction of CD of the corresponding number. FIG. 15(a) illustrates the state where No. 6 CD can be reproduced, and FIG. 15(b) illustrates the state where No. 1 CD can be reproduced.

Here, No. 2 CD is selected as described above, so that the pins 77 are lifted to the top but one position as shown in FIG. 16(a). The above operation allows CD reproduction. Subsequent operation is the same with CD of any number selected, and is ensured by movement of the outer sliders 140 and driving of the transfer motor 46.

Operation will be described after the standby state as shown in FIG. 16(a) where No. 2 CD is selected for reproduction. The standby state refers to the state when the pin 22 b occupies a position D on the outer slider 140 as shown in FIG. 16(b), i.e. the state as shown in FIG. 16(a), wherein the separating cam 82 is positioned as shown in FIG. 22. When the outer slider 140 is moved forward to bring the pin 22 b to a position E as the first step, the separating cam 82 is moved forward to have the lower rear head introduced between the pins 2 d of the top but one and top but two mounting stages 2 as shown in FIG. 21(a) (and also the lower front head introduced between the pins 2 c for the same subsequent operation as that of the pins 2 d). When the pin 22 b is in a position F as the second step, the pin 2 d of the top but one mounting stages 2 is slid along the first separating control part 82 c ₁, to be on the upper-stage engagement 82 j, and the upper head of the separating cam 82 is introduced between the pins 2 d of the topmost and top but one mounting stages 2, falling in the state as shown in FIG. 23. When the pin 22 b is in a position G as the third step, the pin 2 d of the first mounting stages 2 is slid along the second separating control part 82 c ₂to be on the top face 82 f of the separating cam 82. As a result, when pin 22 b is in the position G as the third step, spaces are formed above and below the selected second mounting stages 2 as shown in FIG. 24.

When a sensor, not shown, senses the pins 22 b arriving at the position G as shown in FIG. 16(b), the transfer motor 46 starts to rotate. As described above, when switching to the reproducing mode, the pins 22 b enter the bottom slits 143 to push downward the lever 113 of the torque providing means 17. Thus, the lever 113 is rotated counterclockwise about the pin 114 in the state as shown in FIG. 28(a), so that the plate 105 is raised to rotate the lever 110 clockwise about the shaft 109, having the gear 112 already meshed with the gear 103 h and also with the gear 104 as shown in FIG. 28(b). Therefore, rotation of the transfer motor 46 is transmitted to the slide bar 116 with the rack 116 b through the drive shaft 30 and the gear train 103, moving the slide bar 116 backward as shown in FIG. 29. Then, since the engagement pin 116 c of the slide bar 116 in the lower rear portion is loosely engaged with the slot 13 a, the hold means 14 are rotated forward. When the positioning pin 119 as shown in FIG. 10(a) goes beyond the position c as a point of inflexion, a biasing force of the toggle spring 120 operates in the opposite direction to rotate the positioning pin 119 to the position a as shown in FIG. 10(b), introducing the chuck plate 99 and the turntable 97 together with the upper and lower arms 12, 13 above and below the selected CD as shown in FIG. 24. When viewing in the plan view, this is changed from the state in FIG. 30 to the state in FIG. 31. A limit switch, not shown, detects rotation of the hold means 14 to stop rotation of the transfer motor 46.

When the outer slider 140 is moved forward to have the pin 22 b in a position H as the forth step as shown in FIG. 16(b), the pin 2 d of the selected mounting stages 2 is lowered in the middle-stage engagement 82 k, so that the selected mounting stages 2 and CD are lowered to place the selected CD on the turntable 97 as shown in FIG. 25. Substantially simultaneously, the separating cam 82 is moved forward together with the outer slider 140 to operate the restriction means 18, which lower the upper arm 12 of the hold means 14 through operation of the hold spring 89, holding the selected CD between the turntable 97 and the chuck plate 99. The following is detailed hold operation. When the pin 22 b is in the position G, and the hold means 14 are in the standby position B, the guide pin 12 a is positioned in the horizontal part 125 a of the guide slot 125 as shown in FIG. 32. When the hold means 14 occupy the reproduction position A, the guide pin 12 a is moved to the vertical part 125 b of the guide slot 125 as shown in FIGS. 21(b) and 33(a). However, since the pin 127 a cannot escape into the escape of the cam groove 82 r of the separating cam 82, the guide pin 12 a is blocked by the rear face of the restraining arm 127, and thus cannot lower. Then, when the pin 22 b is moved to the position H, the separating cam 82 is also moved forward, so that the pin 127 a can escape into the escape of the cam groove 82 r as shown in FIGS. 21(b) and 33(b). The pin 127 a of the restraining arm 127 biased by the spring 128 is moved upward to the escape of the cam groove 82 r of the separating cam 82, lowering the rear portion of the restraining lever 128. As a result, the upper arm 12 biased by the hold spring 89 is lowered as shown in FIG. 34 to hold the selected CD as described above.

The center of rotation of the hold means 14 is accurately positioned on the bottom plate 1 e by arranging the support 92 erectly arranged on the bottom plate 1 e through the hollow shaft 86 as the center of rotation of the hold means 14, and the positioning pin 119 is pressed against the pickup lifting/lowering stage 10 by the toggle spring 120 for holding, obtaining accurate positioning of the turntable 97 and the chuck plate 99 on the circumferential locus. On the other hand, the guide supports 23 for guiding the mounting stages 2 for mounting the CD 171 thereon are also erectly arranged on the bottom plate 1 e in the same way as the support 92, obtaining accurate positioning of the CD 171 on the bottom plate 1 e. Therefore, the centers of CD to be reproduced, the turntable 97, and the chuck plate 99 coincide with each other, resulting in sure hold of the CD 171.

When the outer slider 140 is moved forward to have the pin 22 b in a position I as the final fifth step as shown in FIG. 16(b), the pin 2 d of the selected mounting stages 2 is lowered to the lower-stage engagement 82 m as shown in FIG. 21(a). Thus, as soon as the selected mounting stages 2 that has contacted the selected CD 171 is lowered as shown in FIG. 26 to separate therefrom, the receiver 2 h of the plate spring 2 e that has retained the selected CD 171 as shown in FIG. 27 is pushed upward by the lower face of the upper-stage engagement 82 c in the rear portion of the separating cam 82 to release the selected CD 171. At that time, the mounting stages 2 below the selected mounting stages 2 are retained by the lower face 82 h of the separating cam 82, and the mounting stages 2 above the selected mounting stages 2 are biased downward by the coil spring 24, preventing the mounting stages 2 from vibrating under the influence of a vibrating vehicle.

After holding the selected CD by the hold means 14 as described above, CD is reproduced with the hold means 14 held in the position A as shown in FIG. 31. With rotation of the spindle motor 96, CD is rotated through the turntable 97. Then, the scanning motor 165 of the pickup unit 16 is rotated, which is transmitted to the threaded shaft 164 to move the optical pickup 165 from the inside to the outside in the radial direction of CD, carrying out CD reproduction.

After CD reproduction, the threaded shaft 164 is reversed to return the optical pickup 162 to the initial position. Then, rotation of the scanning motor 165 is stopped, and also rotation of the spindle motor 96 is stopped. Subsequently, through reverse steps, the outer slider 140 is moved backward, and also the separating cam 82 is moved backward. When the pin 127 a is returned from the position H to the position G as shown in FIG. 21(b), the pin 127 a of the restraining arm 127 that has been positioned as shown in FIG. 33(b) is disengaged from the escape of the separating cam 82 as shown in FIG. 33(a) to move downward, lowering the rear portion of the restraining arm 127. As a result, the guide pin 12 a protruding outward from the hold means 14 is pushed upward along the vertical part 125 b of the guide slot 125 to put the hold means 14 in the rotatable state. Subsequently, a sensor, not shown, senses upward movement of the guide pin 12 a to rotate the transfer motor 46 in the direction opposite to the above direction, obtaining backward rotation of the hold means 14. When the positioning pin 119 that has occupied the position b as shown in FIG. 10(b) goes beyond the position c as a point of inflexion, a basing force of the toggle spring 120 operates in the opposite direction to rotate the positioning pin 119 to the position b as shown in FIG. 10(a), returning the hold means 14 to the position B or standby position. A limit switch, not shown, detects rotation of the hold means 14 to stop rotation of the transfer motor 46. The hold means 14 are biased backward by the toggle spring 120 even in the standby position B, failing to be influenced from vibrations of the vehicle. Then, when the outer slider 140 is moved backward to return the pin 22 b to the standby position D as shown in FIG. 16(b), the separating cam 82 is also moved backward to lower all of the first to third mounting stages 2, returning the mounting stages 2 to the state as shown in FIG. 22 where the six mounting stages 2 are not separated.

When reproducing other CD than the top but one CD, the inner slider 139 is moved forward or backward in the state as shown in FIG. 16(a) to relatively move the pin 22 b to any of the positions 1, 3, 4, 5 and 6 assigned to the inner slider 139. Then, the outer slider 140 is slid to successively align the positions D-I on the outer slider 140 to the pin 22 b, obtaining repetition of the same operation as described above.

The embodiment is shown with regard to application of the disc recording and/or reproducing device to a disc player for reproducing sound. Alternatively, the device may be applied to sound recording or recording/reproducing devices or image recording and/or reproducing devices. Moreover, the embodiment is shown with the mounting stages placed vertically, optionally, the mounting stages can be placed horizontally. Furthermore, the disc has a size of 12 cm, optionally, it may have other size such as 8 cm.

INDUSTRIAL APPLICABILITY

As described above, the holding device according to the present invention includes two divided disc mounting portions to form first and second disc holding means for mounting one and another of the disc peripheral portions, allowing reduced size of the component parts of the disc holding device, resulting in a suitable reduction in size, weight and cost of the disc recording and/or reproducing device. 

What is claimed is:
 1. A disc holding device, characterized in that it comprises: a first disc holding means including a first disc mounting means for mounting a first outer peripheral portion of a disc and a first bias means for biasing said first outer peripheral portion of said disc toward said first disc mounting means; and a second disc holding means including a second disc mounting means for mounting a second outer peripheral portion of said disc and a second bias means for biasing said second outer peripheral portion of said disc toward, in a vertical direction with respect to, said second disc mounting means, wherein said first disc holding means and said second disc holding means are separately disposed to face each other so as to hold thereby said disc.
 2. The disc holding device as specified in claim 1, wherein said first bias means and said second bias means comprise engaging portions to be engaged with a bias releasing means, respectively.
 3. The disc holding device as specified in claim 1, wherein said first outer peripheral portion of said disc and said second peripheral portion of said disc are substantially opposite to each other across a center portion of said disc.
 4. A disc recording and/or reproducing device, characterized in that it comprises: a plurality of first disc holding means including first disc mounting means for mounting a first outer peripheral portion of a disc and first bias means for biasing said first outer peripheral portion of said disc toward said first disc mounting means; and a plurality of second disc holding means including second disc mounting means for mounting a second outer peripheral portion of said disc and second bias means for biasing said second outer peripheral portion of said disc toward, in a vertical direction with respect to, said second disc mounting means, wherein said plurality of first disc holding means and said plurality of second disc holding means are separately disposed to face each other so as to hold thereby said plurality of discs.
 5. The disc recording and/or reproducing device as specified in claim 4, wherein said first bias means and said second bias means comprise engaging portions, respectively, and bias releasing means are provided to be engaged with said engaging portions for releasing the disc holding state produced by said first disc holding means and said second disc holding means.
 6. The disc recording and/or reproducing device as specified in claim 4, further comprising guide means for guiding a disc to be loaded when the disc is loaded onto one of said plurality of first disc holding means and one of said plurality of second disc holding means.
 7. The disc recording and/or reproducing device as specified in claim 6, wherein said guide means comprise a recess for guiding the disc.
 8. The disc recording and/or reproducing device as specified in claim 6, wherein said guide means are fixedly mounted to a top plate of a casing.
 9. The disc recording and/or reproducing device as specified in claim 6, wherein said plurality of first disc holding means and said plurality of second disc holding means are movable with respect to said guide means so as to allow loading of the disc onto each of said first disc holding means and each of said second disc holding means. 